Unit4Topic3SectionC

1、unit 4 amazing sciencetopic 3 china is the third nation that sent a person into space. section cwhat are the computers used for?1a 1. tick the fields we use the computer in. education business industry communication daily life medical care entertainment sports doctors can find diseases easily with t

2、he help of computers. can you give an example of the use of the computer in one of the fields above? in space, computers have been used to control the speed and direction of a spaceship. what is the passage about ?the importance of computersunderline the topic sentence of each paragraph. 1. since co

3、mputers were invented in the usa in the 1950s, they have become very important in many areas of work and leisure. 2. since the internet came into being, peoples lives at home have been changed, too. 3. computers have improved our lives, but they have brought problems, too. place the usage of compute

4、rsin spacein hospitalsin factoriesin business control the speed and directionfind diseases easily and solve other problemsdo dangerous workused to place and cancel orders there is no doubt that we will be successful. i dont doubt that they will be able to solve the problems.doubtn. & v.怀疑，疑惑怀疑，疑

5、惑(2)doubt (vt.)+ 从句(3)doubt (vi.)+ about / ofdoubt is the key to knowledge.there is no reason to doubt of his honesty.i doubt whether/if hell change his mind. (1)doubt (n.) 1.there is no doubt that computers are very useful in technology and business.毫无疑问电脑在技术和贸易业都非常有用。毫无疑问电脑在技术和贸易业都非常有用。 2.for exam

6、ple , tiny computers which are inside patients bodies can keep their hearts beating normally.例如，病人体内植入微电脑能帮助病人例如，病人体内植入微电脑能帮助病人的心脏正常搏动。的心脏正常搏动。 64英寸英寸 超大型（超大型（huge）32英寸英寸 大型（大型（large）16英寸英寸 中型（中型（medium）8英寸英寸 小型（小型（small）4英寸英寸 超小型（超小型（tiny）tiny very small in size adj. 极小的，微小的a tiny girlprep.在内adv.在里

7、面language points 3.the whole world is connected.网络连接了全网络连接了全世界世界。 connect v. 连接connection n. 关系，联系1.connect a with b 使a与b连接2.connect sth. (to sth.) 使电、气、水等接通3.connect sb./sth. (with sb./sth.) 与有联系，把联系起来 come into being more and more watch movies thanks to do business instead of chat online make the

8、world smaller 做买卖做买卖 形成，产生形成，产生 越来越多越来越多 看电影看电影 代替代替 网上聊天网上聊天 使世界更小使世界更小 多亏，由于多亏，由于1. for instance, if we work on computers too long, we may get headaches or sore eyes.比如：比如：如果我们使用的电脑工作的时间太长，我们就会头昏眼花。如果我们使用的电脑工作的时间太长，我们就会头昏眼花。 for instance =for example 用来举例说明某一论点或情用来举例说明某一论点或情况，一般只举同类人或物中的况，一般只举同类人或

9、物中的“一个一个”为例。为例。 such as 用来列举事物时，一般列举同类人或事物中的几用来列举事物时，一般列举同类人或事物中的几个例子。个例子。 e.g. （1）many countries, japan, for instance (for example), has a lot of earthquakes. （2）i like fruits, such as apples, pears and bananas. (1)besides与与except用于肯定句时，用于肯定句时，except意为意为“除除之外（不之外（不 再有）再有）”；besides意为意为“除除之外（还有）之外（还有

10、）”。 如：如： i have another blue pen besides this one.除了这支外，我还有另一支蓝色钢笔。（除了这支外，我还有另一支蓝色钢笔。（1+1，共，共2支）支）we all passed the exam except tom.我们都通过了考试，汤姆除外。（整体中我们都通过了考试，汤姆除外。（整体中汤姆一人不及格）汤姆一人不及格）(2)except前几乎总有前几乎总有all、any、every、no及其复合词等词。及其复合词等词。如：如：he answered all the questions except the last one.除了最后一个问题没答外

11、，其余问题他都答了。除了最后一个问题没答外，其余问题他都答了。(3)except后接名词、代词、动名词和动词原形，这时后接名词、代词、动名词和动词原形，这时except=but；但但except后跟副词、介词短语时，不能用后跟副词、介词短语时，不能用but代替。代替。如：如：the window is never open except in summer. 这扇窗户从来不开，除夏季外。这扇窗户从来不开，除夏季外。he did nothing except/ but clean the house. 他只是打扫了房子。他只是打扫了房子。 2. besides, not everything w

12、e read on the internet is true or good for us.另外，我们在网上看到的东西并不都是真实的、有益的。另外，我们在网上看到的东西并不都是真实的、有益的。 1b 2. complete the following diagram. computers usageproblemwork daily life1. _ of a spaceship. 2. help doctors _. 3. _ in factories. 4. help businessmen _.1. play games and _. 2. _ and _ at home. 3. _ b

13、y sending e-mails and _. 1. get headaches or _. 2. dont have enough time _. 3. something on internet is not _.control the speed and direction find diseases easilycontrol the robotsplace and cancel orders watch movies do shopping do businesscommunicate chatting online sore eyesto study or exercise tr

14、ue or goodproperly, besides, brought, get, enough computers have improved our lives, but they have _problems, too. for instance, if we work on computers too long, we may _ headaches or sore eyes. if we play computer games too much, we wont have _ time to study or exercise. _ , not everything we read

15、 on the internet is true or good for us. computers help us at work and at home, but they must be used _. broughtgetenoughbesidesproperly2 write a short passage with the title with one day without computers. the following information may help you. suppose you were on a special day in 2030. during the

16、 day, there were no computers in the world. what trouble would you have? you may begin like this: one day without computers today, when i got up, i just turned on the computer as usual, but it didnt work. then i tried my brothers pc, my parents, even my dogs, but none of them worked. later, it was r

17、eported on tv that all of the computers in the world broke down today one day without computers today, when i got up, i just turned on the computer as usual, but it didnt work. then i tried my brothers pc, my parents, even my dogs, but none of them worked. later, it was reported on tv that all of th

18、e computers in the world broke down today. so the world is quite different. for instance, we cant play games, watch movies or do shopping at home. besides, we cant communicate by sending e-mails or chatting online. without the help of computers, businessmen cant place or cancel orders online. teachers cant give lessons to their students. whats worse, robots controlled by computers cant do dangerous work for humans. even the doctors cant find the diseases easily. in short, we almost have trouble with e